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Help CenterASTM A106 Grade B Seamless Carbon Steel Pipe, 4 Inch Schedule 40, 20 ft Length
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Welcome to Hemaokang Steel (Shandong) Co., Ltd. — your trusted partner for high-quality carbon steel piping solutions. As a newly established yet rapidly growing exporter with an annual export value of US$50 Million - US$100 Million, we are committed to delivering ASTM A106 Grade B Seamless Carbon Steel Pipe that meets the rigorous demands of global industries. Our 4-inch Schedule 40 pipe, supplied in standard 20-foot lengths, combines exceptional mechanical strength with reliable performance, making it the preferred choice for high-pressure and high-temperature applications. With our ISO9001-certified quality management system and a dedicated team of 51-100 professionals, we ensure every pipe meets strict international standards.
This product is manufactured from premium carbon steel, featuring seamless construction that eliminates weak points associated with welded seams. The Grade B designation indicates enhanced tensile strength and yield strength compared to Grade A, while the Schedule 40 wall thickness provides a robust balance between pressure capacity and weight. Whether you require pipes for petroleum refining, natural gas transportation, steam lines, or structural applications, our ASTM A106 Grade B seamless pipe offers durability and longevity.
At Hemaokang Steel, we understand that every project has unique requirements. That's why we offer customizable surface treatments (such as black varnished, galvanized, or coated) and can provide additional lengths upon request. Our product is packaged securely for export, with shipment available from the port of Qingdao to destinations across North America, South America, Europe, Asia, Africa, and Oceania. Below you will find detailed specifications and benefits that demonstrate why our pipe is the right choice for your next project.
Product Specifications
| Parameter | Value |
| Standard | ASTM A106 / ASME SA106 |
| Grade | Grade B |
| Nominal Pipe Size (NPS) | 4 inches |
| Wall Thickness (Schedule 40) | 6.02 mm (0.237 in) |
| Outside Diameter | 114.3 mm (4.5 in) |
| Length | 20 ft (6.1 m) — other lengths available upon request |
| Weight per Unit Length | Approx. 16.07 kg/m (10.79 lb/ft) |
| End Finish | Plain ends, beveled ends, or threaded (customizable) |
| Pipe Type | Seamless (hot finished or cold drawn) |
| Surface Treatment | Black varnished, oiled, or as per customer specification |
Key Features & Benefits
- Seamless Construction: Eliminates weld defects, providing uniform strength and resistance to pressure and thermal stress. Ideal for high-pressure steam, gas, and oil lines.
- High Mechanical Strength: Grade B offers minimum yield strength of 240 MPa (35,000 psi) and tensile strength of 415 MPa (60,000 psi), ensuring reliable performance under demanding conditions.
- Excellent Weldability: Despite being seamless, the pipe can be easily welded or fabricated using standard methods, allowing for field modifications and connections.
- Corrosion Resistance: The carbon steel composition can be further enhanced with protective coatings (e.g., FBE, 3LPE) to extend service life in corrosive environments.
- Precise Dimensions: Manufactured to tight tolerances per ASTM A106, ensuring compatibility with standard fittings, flanges, and valves.
- Material Traceability: Each pipe is marked with heat number, grade, size, and mill stamp, ensuring full traceability from raw material to final product.
- Cost-Effective: Compared to alloy or stainless steel, carbon steel offers excellent value for medium-duty applications without compromising safety.
Typical Applications
- Petroleum and natural gas transmission pipelines
- Refinery and petrochemical plant piping systems
- Power generation (steam, boiler tubes)
- High-pressure water and air lines
- Structural and mechanical support in construction
- Shipbuilding and offshore platforms
Our ASTM A106 Grade B seamless pipe is manufactured in accordance with the latest edition of ASTM A106, covering seamless carbon steel pipe for high-temperature service. The ISO9001 certification held by Hemaokang Steel ensures that every production process — from raw material inspection to final testing — is strictly controlled. We also conduct non-destructive testing (NDT) such as eddy current, ultrasonic, and hydrostatic testing as per standard requirements, with optional third-party inspection available.
As a company with an annual export value exceeding US$50 million, we have established a robust supply chain capable of fulfilling bulk orders efficiently. Our team of 51-100 experienced professionals coordinates logistics, quality control, and customer service to ensure timely delivery to your doorstep. With markets spanning North America, South America, Europe, Asia, Africa, and Oceania, we have the expertise to meet diverse international requirements.
We invite you to experience the reliability and performance of our products. Whether you need a single pipe for a replacement job or a full container load for a large-scale project, Hemaokang Steel is your reliable partner. Contact us today to request a quote, discuss your specific requirements, or obtain a sample for testing. Our team is ready to provide you with competitive pricing and professional support.
Frequently Asked Questions (FAQ)
-
Q: What is the difference between ASTM A106 Grade B and Grade A?
A: Grade B has higher minimum yield (240 MPa vs. 205 MPa) and tensile strength (415 MPa vs. 330 MPa) compared to Grade A, making it suitable for higher pressure and temperature applications. Grade B is the most commonly specified grade for carbon steel pipe in industrial service. -
Q: Can this pipe be used for low-temperature applications?
A: ASTM A106 is primarily intended for high-temperature service. For low-temperature applications, materials like ASTM A333 are recommended. However, our pipe can be used in moderate low-temperature environments if properly evaluated for impact properties. -
Q: Is heat treatment applied to this pipe?
A: Per ASTM A106, the pipe is normally supplied in the as-rolled (hot finished) condition. However, cold-drawn pipes may be stress relieved. We can also provide normalized or quenched and tempered pipes upon request. -
Q: What are the available end finishes?
A: Standard finishes include plain ends (square cut), beveled ends for welding, and threaded ends with couplings. Custom end finishes are available per your drawing or specification. -
Q: How is the pipe packaged for export?
A: Pipes are bundled with steel straps, with plastic caps on ends to protect threads and bevels. Bundles are wrapped in waterproof material if required. For breakbulk shipments, individual pipes are secured with wooden spacers. -
Q: Do you provide third-party inspection certificates?
A: Yes, we can arrange inspection by agencies such as SGS, BV, or Lloyd's at the buyer's cost. Our own mill test certificates (MTC) are provided free of charge with each shipment. -
Q: What is the minimum order quantity (MOQ)?
A: MOQ for standard sizes is 1 ton (approximately 10 pieces of 20 ft pipe). For smaller quantities, please contact us for availability and pricing. -
Q: How long does delivery take?
A: Typical lead time is 15-30 days after order confirmation, depending on quantity and production schedule. Expedited shipping is available for urgent orders.
* All information provided is based on manufacturer specifications and standard industry practices. Hemaokang Steel reserves the right to update product details without prior notice. For the most accurate and current information, please consult our technical team.
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